How do you winter proof a window air conditioner? Remove the outside cover from the window AC unit so that the inside components are exposed. Place a thick plastic garbage bag over the unit so it covers it completely and tuck the excess parts of the bag inside so it is fully sealed. Use duct tape to hold the bag in place if necessary.

Is it OK to leave air conditioner in window during winter? We recommend you remove any air conditioner from a window location. During the winter months, heat could escape through the accordion extension panels on the A/C and the chassis; cold air could also infiltrate your home the same way. To avoid injury, move the unit with another person.

Should you cover an air conditioner in the winter? Mold risk: Your air conditioner is made to be open to the air. Covering your air conditioner will block proper air flow which can lead to mold growth on your evaporator coils. The mold can block proper airflow through your coils and decrease your air conditioner’s efficiency.

How do you cover a window air conditioner? 

Here are some things you can do to effectively cover the spaces above the AC unit:
  1. Attach weatherstripping.
  2. Get insulated side panels.
  3. Use a rope caulk with acrylic glass.
  4. Secure with foam insulation and plywood.
  5. Use spray foam sealant.

How do you winter proof a window air conditioner? – Additional Questions

How long can you leave a window AC on?

A window AC or portable air conditioner can run 24 hours a day, 7 days a week without shortening its average lifespan. Running continuously will not cause overheating, excessive wear and tear to the unit, or any other damage that will shorten its life.

Do you remove portable air conditioner in winter?

If you want to keep your portable air conditioner working at peak capacity, you’ll need to winterize it before storing it away at the end of summer. It prevents damage to the inner hardware, keeps equipment from getting lost, and extends the operational lifespan of your machine.

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